David Letterman’s top ten list last night was the top ten excuses for Rick Perry’s debate mistake, read by none other than Rick Perry himself. And he only forgets one of them! That’s progress. We can probably all agree that the most convincing excuse here is the blinding power of Mitt Romney’s smile. He is one hunk of man, right? That jawline! Those white stripes at his temples! He’s like a handsome skunk!